Malicious PDF — malware analysis report

Static analysis result for SHA-256 c667196bf1d52424…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 18:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2299c363512e963c36df78f01d4cf020 SHA-1: 9806bf1ca671d56306297b2354c191140a2dcd24 SHA-256: c667196bf1d524247760268dc3d8d12c5ddbba5f3b358ff55e3d84876638c23b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms strongly suggests the file's purpose is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=tom+hero+dash+download+apk PDF link annotation
    • http://fantasymusic.it/userfiles/files/92745537768.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/51066951824.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/pewugalefujigoberarirusup.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/fegizobexezenezew.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qcqjarrs179qdiirls997nbvk1/rupazojiduboxawotineji.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/bedizabagimenizujuxedep.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd565177a---kojezopipewufuratev.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/21lvrhj8jfkiv58rjjr7iea794/74357698927.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/juserusi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/12954478789.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/jarub.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/zoxowajadogukebukewete.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613460ab38910---seleguze.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/wawesemomix.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/tifubufefowuxomekupe.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/74491815192.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918c7c5c47---26381615713.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/35247531489.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/20704187857.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b7dce01f---18016195728.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/wujumibupupexememux.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210902081156_2ac2cz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131accd67e38---piwiluxosibafevisobako.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 18204 bytes
SHA-256: 41b58e5f285aff60a0bb4ad121d68f940c594ff9ada6ce84fba1c3ef342db456
font_01_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 10608 bytes
SHA-256: 3c13f55117f82b281c6d3faeb42c879c56d175dc9c87c624db17d1c01ac10691

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